Related Experiment Video
Updated: Jun 21, 2026
09:44
Oral Biofilm Analysis of Palatal Expanders by Fluorescence In-Situ Hybridization and Confocal Laser Scanning Microscopy
Published on: October 20, 2011
Exploring the oral bacterial flora: current status and future directions
N B Parahitiyawa1, C Scully, W K Leung
1Oral Biosciences, Faculty of Dentistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong (SAR), China.
Oral Diseases
|July 25, 2009
Summary
Cultivation-independent methods reveal greater oral bacterial diversity than traditional culturing, identifying over 700 species. These advanced techniques are crucial for understanding oral microbiome dynamics and associated diseases.
Area of Science:
- Microbiology
- Human Microbiome Research
Background:
- The oral cavity hosts a diverse microbiome, with shifts in bacterial dynamics linked to various pathologies.
- Understanding oral flora composition is critical for diagnosing and treating oral and systemic diseases.
Purpose of the Study:
- To review and compare traditional cultivation-based and modern cultivation-independent methods for detecting oral bacteria.
- To highlight the advantages of newer techniques in revealing the full spectrum of oral microbial diversity.
Main Methods:
- A comprehensive literature review of cultivation-based, microscopic, immunological, and metagenomic identification techniques.
- Appraisal of the strengths and limitations of each method for oral bacterial detection.
Main Results:
- Cultivation-based methods significantly underestimate oral bacterial diversity due to the fastidious nature of many species.
- Cultivation-independent methods are more sensitive, effectively identifying difficult-to-culture and novel oral bacterial species.
Conclusions:
- Oral microbiome analysis reveals over 700 bacterial species, many previously uncharacterized.
- Advanced techniques like pyrosequencing expand our understanding of bacterial diversity within oral niches and their implications.
Related Concept Videos
01:27The Oral Microbiota
The oral microbiome includes a complex ecosystem comprising over 700 microbial species, identified through genomic sequencing and culture-based analyses to date. This community includes a core microbiome, found universally among individuals, and a variable component influenced by environmental factors such as diet, lifestyle, and host genetics. Site-specific conditions, including oxygen gradients, pH levels, and nutrient availability, determine the spatial distribution of these microorganisms...
01:28Development of the Oral Microbiota
The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...
01:22Introduction to the Human Microbiota
Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity, and disease...
01:29Microbiota of the Respiratory Tract
The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more like...
01:21Microbiota Modulation by Antibiotics
Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...
01:20Applications of Molecular Taxonomy
Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...